Article
Engineering, Electrical & Electronic
Yong Mei Pan, Yang Hu, Shao Yong Zheng
Summary: A simple method using specific higher-order modes has been investigated to improve the isolation of dielectric resonator antenna elements, resulting in low mutual coupling levels and avoidance of radiation pattern distortion. This decoupling technique is effective for reducing both E-plane and H-plane coupling without the need for extra decoupling elements in the antenna system. Fabrication and measurements of a MIMO DRA array showed that using the proper mode can enhance isolation from about 15 to 45 dB at 5.25 GHz.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Chen Yang, Kwok Wa Leung
Summary: A 3-D-printed wideband circularly polarized (CP) multiple-input-multiple-output (MIMO) antenna is proposed, which consists of two CP dielectric resonator antennas (DRAs) covered by a dielectric decoupler. The center-to-center distance between the two DRAs can be made as small as 0.33?(0) with a high isolation using the decoupler. The measured results of a prototype operating in X-band show a -10-dB impedance bandwidth of 21.7% (8.88-11.04 GHz), with an axial-ratio (AR) bandwidth and mutual coupling both less than 3 and -21.4 dB, respectively. The impedance and AR have a wide overlapping bandwidth of 21.7%.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Computer Science, Information Systems
Ming Xu, Jingwei Zhang
Summary: This paper presents a circularly polarized multiple-input multiple-output dielectric resonator antenna for 5G millimeter-wave applications. The antenna achieves wideband impedance and optimized axial ratio performance through the use of modified cross slots and complementary split ring resonators.
Article
Engineering, Electrical & Electronic
Yang Hu, Yong Mei Pan, Mei Di Yang
Summary: This study investigates a circularly polarized MIMO antenna consisting of two identical DRAs, which effectively increase isolation between them and allow for simultaneous operation. By using metal strips to change the E-field rotation direction, the polarization properties of the passive DRAs are reversed compared to the active DRAs. The prototype antenna operating in the 2.4 GHz WLAN band showed a significant improvement in isolation between the two CP DRAs.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Nikesh Kumar Sahu, Ravi Kumar Gangwar
Summary: This study proposes a decoupling method based on metallic sheets to improve inter-port isolation in MIMO dielectric resonator antenna systems. By utilizing metallic sheets, the electromagnetic energy is restricted to nearby slots, resulting in significant improvement in inter-port isolation. This method allows for a compact and simple antenna arrangement without requiring additional footprint.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2022)
Article
Engineering, Electrical & Electronic
Min Li, Singwai Cheung
Summary: This study introduces a novel decoupling method using a dielectric superstrate to reduce coupling between multiple-input multiple-output dielectric resonator antennas. Results show significant isolation enhancement and improvements in radiation characteristics, offering a unique approach for isolation enhancement of MIMO DRAs.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Zi-Kang Chen, Li Zhang, Zibin Weng, Rui-Yang Li
Summary: This letter presents a wideband wide-beam rectangular di-electric resonator antenna (DRA) using uniaxial anisotropic material for the first time. By tuning the uniaxial permittivity tensor, the radiation from the top wall of the DRA is enhanced and the gain at low elevation angle in the E-plane is improved. The bandwidth is broadened by merging the feed slot mode and the fundamental TE(111)(y) mode. The addition of a grounded substrate and trapezoidal notches on the ground broadens the half-power beamwidth (HPBW) in the H-plane. The measured results show an impedance bandwidth of 35.7% over a band of 2.65-3.8 GHz with HPBWs of at least 250 degrees and 162 degrees in the E-and H-planes, respectively.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Bing Zhang, Jian Ren, Yu-Xiang Sun, Ying Liu, Yingzeng Yin
Summary: This paper presents a four-port cylindrical pattern diversity and polarization-diversity dielectric resonator antenna (DRA) for MIMO applications. The design utilizes degenerate modes of the cylindrical DRA to achieve efficient mode excitation and utilization of diversity. The performance of the design is verified through simulation, fabrication, and measurement, and the indoor communication performance is evaluated.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Chemistry, Analytical
Kaiwen Du, Yongshun Wang, Lijun Zhang, Yao Hu
Summary: This paper proposes an antenna pair suitable for mobile terminals, which has a wide band, coupling suppression, and compact size. By optimizing the antenna structure based on characteristic modes theory, the proposed antenna pair achieves a -10 dB bandwidth of 3.23-5.24 GHz and lower isolation with only 2 mm spacing. The eight-port MIMO system constructed with four antenna pairs demonstrates excellent performance in terms of bandwidth and efficiency.
Article
Chemistry, Multidisciplinary
Zhao Liu, Yongshun Wang, Yao Hu, Lijun Zhang
Summary: We propose a broadband decoupled antenna pair for 5G mobile terminals, which is based on the characteristic mode theory and defective ground structure. By applying the characteristic mode theory, the characteristic current distribution of the antenna is obtained and optimized to introduce new modes and achieve a wide bandwidth. The addition of a defective ground structure to the antenna pair results in a wideband decoupled antenna pair with small size and high isolation.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Electrical & Electronic
Xiyao Liu, Kwok Wa Leung, Nan Yang
Summary: A compact horizontally polarized omnidirectional dielectric resonator antenna excited in the TE011+delta mode is presented, with an enhanced impedance bandwidth and suppressed cross-polar field. This antenna can be polarization reconfigured using diodes to switch between horizontal and vertical polarizations, with stable omnidirectional radiation patterns in both states.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Yan-Ting Liu, Boyuan Ma, Shaode Huang, Shiyan Wang, Zhang Ju Hou, Wen Wu
Summary: This paper presents a wideband low-profile connected rectangular ring dielectric resonator (DR) antenna array for millimeter wave (mmWave) applications. The array consists of four rectangular ring DRA elements excited by microstrip feedlines. Various modes are excited simultaneously to achieve wideband design. The position of the dielectric arms connecting the DRAs has significant effects on the antenna performance. The prototype demonstrates good agreement between measured and simulated results, with a measured impedance bandwidth of 31.6% (22.52-30.97 GHz).
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Chemistry, Analytical
Xue-Ping Li, Jun-Fei Ji, Chang-Jiao Duan, Qian-Qian Sun, Wei Li, An-Xue Zhang
Summary: This paper proposes a novel ultra-compact four-port MIMO cylindrical dielectric resonator antenna with improved isolation for WLAN applications. By adjusting impedance matching and introducing a U-shaped slot design, the antenna successfully achieves decoupling and improved isolation. Simulation, fabrication, and testing results demonstrate the antenna's excellent performance.
Article
Engineering, Electrical & Electronic
Majedehsadat Rad, Nastouh Nikkhah, Bijan Zakeri, Mohammad Yazdi
Summary: This paper presents two wideband dual-polarized dielectric resonator antennas for X-band radar applications and provides the design process and measurement results. The antennas demonstrate wideband impedance bandwidth and axial ratio, and offer both RHCP and LHCP radiation. They are suitable for various radar applications.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Megha Agarwal, Jasdeep Kaur Dhanoa, Mukesh Kumar Khandelwal
Summary: A throne-shaped compact ultrawideband (UWB) two-port multiple-input multiple-output (MIMO) antenna operating from 2.9 to 11.5 GHz is introduced. Dual-band rejections are achieved at 5.5 and 7.5 GHz frequencies through specific design and fabrication processes. The antenna demonstrates low mutual coupling and satisfactory performance in terms of gain, radiation pattern, and efficiency.
INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS
(2022)
